R help - Jan 2007 - How to generate 'minor' ticks in lattice (qqmath)

Dear group,

I tried to generate labels for every second tick in lattice (qqmath).
Version: 0.14-16
Date: 2006/12/01

R version 2.4.1 (2006-12-18)

An example:

library(lattice)
numy=100
y=runif(numy,min=0,max=1)
sig=0.05
numsig=length(which(y<sig))

tck.no=11 # number of ticks
tcks=1:tck.no
labl=as.character(0.1*tcks-0.1) # label for all ticks
labl[seq(2,tck.no-1,2)]="" # delete every second label
nums=seq(0,(tck.no-1)/10,(tck.no-1)/100)

qqmath(y,distribution=qunif,
  prepanel=NULL,
  panel=function(x)
    {
    panel.abline(c(0,1),lty=2)
    
panel.polygon(c(0,0,numsig/numy,numsig/numy,0),c(0,sig,sig,0,0),lwd=0.75)
    panel.qqmath(x,distribution=qunif,col=1)
    },
    scales=list(
      tck=c(1,0),
      x=list(at=nums,labels=labl),
      cex=0.8),
    xlab=paste("uniform [0,1] quantiles"),
    ylab="runif [0,1]",
    min=0,max=1)

Two questions:
1. How do I define the same labels for the second (left) axis (I suspect 
a second dimension in scales(list(x=list...) would do the job, but I 
haven't been able finding out, how...
2. Is there any alternative to obtain minor ticks in lattice like 
"minor.ticks" in Hmisc?

Best regards,
Helmut

-- 
Helmut Sch?tz
BEBAC
Consultancy Services for Bioequivalence and Bioavailability Studies
Neubaugasse 36/11
1070 Vienna/Austria
tel/fax +43 1 2311746
Web http://BEBAC.at
BE/BA Forum http://forum.bebac.at
http://www.goldmark.org/netrants/no-word/attach.html

Another approach is shown in the last example at the bottom of:

library(zoo)
?xyplot.zoo

On 1/23/07, Helmut Sch?tz <helmut.schuetz at bebac.at>
wrote:
> Dear group,
>
> I tried to generate labels for every second tick in lattice (qqmath).
> Version: 0.14-16
> Date: 2006/12/01
>
> R version 2.4.1 (2006-12-18)
>
> An example:
>
> library(lattice)
> numy=100
> y=runif(numy,min=0,max=1)
> sig=0.05
> numsig=length(which(y<sig))
>
> tck.no=11 # number of ticks
> tcks=1:tck.no
> labl=as.character(0.1*tcks-0.1) # label for all ticks
> labl[seq(2,tck.no-1,2)]="" # delete every second label
> nums=seq(0,(tck.no-1)/10,(tck.no-1)/100)
>
> qqmath(y,distribution=qunif,
>  prepanel=NULL,
>  panel=function(x)
>    {
>    panel.abline(c(0,1),lty=2)
>
> panel.polygon(c(0,0,numsig/numy,numsig/numy,0),c(0,sig,sig,0,0),lwd=0.75)
>    panel.qqmath(x,distribution=qunif,col=1)
>    },
>    scales=list(
>      tck=c(1,0),
>      x=list(at=nums,labels=labl),
>      cex=0.8),
>    xlab=paste("uniform [0,1] quantiles"),
>    ylab="runif [0,1]",
>    min=0,max=1)
>
> Two questions:
> 1. How do I define the same labels for the second (left) axis (I suspect
> a second dimension in scales(list(x=list...) would do the job, but I
> haven't been able finding out, how...
> 2. Is there any alternative to obtain minor ticks in lattice like
> "minor.ticks" in Hmisc?
>
> Best regards,
> Helmut
>
> --
> Helmut Sch?tz
> BEBAC
> Consultancy Services for Bioequivalence and Bioavailability Studies
> Neubaugasse 36/11
> 1070 Vienna/Austria
> tel/fax +43 1 2311746
> Web http://BEBAC.at
> BE/BA Forum http://forum.bebac.at
> http://www.goldmark.org/netrants/no-word/attach.html
>
> ______________________________________________
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> and provide commented, minimal, self-contained, reproducible code.
>